like what they found when they scrambled over the top. It was a little valley in the moorland, shut in by another waterfall at the head of it, not a hundred yards away, and by slopes of rock and heather that rose so steeply that when the explorers looked up they could see nothing but the sky above them. In there it was as if the blue mountains did not exist. The valley might have been hung in air, for all that they could see outside it, except when they turned round and looked back, from the top of the waterfall they had climbed, to the moorland, the woods and the hills on the other side of the lake.
“It’s a lovely place for brigands,” said the boy.
“It’s just the place for Peter Duck,” said the able-seaman. “It’s the most secret valley that ever there was in the world.”
Peter Duck had grown up gradually to be one of the able-seaman’s most constant companions, shared now and then by the boy, but not taken very seriously by the others, though nobody laughed at him. He had been the most important character in the story they had made up during those winter evenings in the cabin of the wherry with Nancy and Peggy and Captain Flint. Peter Duck, who said he had been afloat ever since he was a duckling, was the old sailor who had voyaged with them to the Caribbees in the story and, still in the story, had come back to Lowestoft with his pockets full of pirate gold. Titty had had a big share in his invention, and now she made him useful in all sorts of ways, sometimes when she and Roger were together, but mostly when she was by herself. Anything might happen to Peter Duck and he would always come out all right. Dolls meant nothing to Titty. Peter Duck was a great deal more useful than any doll could have been. He could always tidy himself away. He never got lost. He had no sawdust to run out. And she had only to think of him, when there he was, ready for any adventure in which he might be wanted.
“He could hide here from anybody who wanted to bother him. I don’t believe he’s ever had a better place. Let’s see what it looks like from the top.”
Roger was already on his feet and crossing the stream, jumping from one dry stone to another.
“You go up that side,” Titty called to him, “and I’ll go up this, and then we’ll see if it’s as secret as it looks.”
They climbed up opposite sides of the valley and looked back at each other. They found they had only to go a few yards from the edge of it not to see that it was there. Titty in the heather above one side of the valley and Roger in the heather above the other side would never, if they had not known, have guessed that a valley lay between them.
“It’s absolutely perfect,” shouted Titty.
“I think so, too,” shouted Roger.
They scrambled down again to meet in the bottom, and followed the stream to the upper waterfall. In several of the little pools on the way they saw small trout, and in the big pool under the waterfall, just as they got there, a larger trout jumped clean into the air after a fly and dropped again into the pool in a splash of silver.
“Peter Duck’ll be able to fish,” said Titty. “He always liked it. Do you remember how he was always trailing a hook for sharks over the stern of the schooner?”
“We’ll fish too,” said Roger. “What about our tea?”
That was the worst of Roger. He might get hungry at any minute.
“Have my chocolate,” said the able-seaman. “I don’t want it.”
“Really?” said Roger.
“Of course,” said Titty.
“Let’s wait and see if that fish jumps again,” said Roger, “and I’ll eat the chocolate while we’re watching.”
Titty handed over her chocolate and looked back down the valley and out through the V-shaped gap at the foot of it to the hills on the other side of the lake, and to other hills beyond them, hills so far away that she might have thought them clouds if the sky overhead had not been so very clear. From this upper end of the valley she could not see the moor below the waterfall, or the woods through which they had climbed. She looked at the valley itself, and its steep sides, one of them, on the right, almost a precipice of rock, with heather growing in the cracks of it, and the other, on the left, not so steep, with grass on it, bracken and loose stones. She was wishing she had her map with her, to mark in it the stream and the newly discovered valley, when, on a warm stone close to her, she saw a tortoiseshell butterfly, resting in the sunshine, with his brown and blue and orange and black wings spread out and all but still.
“Isn’t he a beauty?” she said, and as she said it the butterfly fluttered off the stone and away down the valley, never far from the ground.
“He’ll perch again and open his wings in a minute,” she said, and indeed the butterfly presently dropped on a clump of heather growing low down in a cleft in the steep slope of grey rock at which she had been looking.
Titty, on tiptoe, followed to look at him, but when she was almost near enough to touch the heather on which he had settled, she forgot all about him. When the butterfly fluttered away once more, she did not even see him go.
“Roger! Roger!” she cried. “It’s a cave!”
Roger heard her, in spite of the noise of the waterfall. He did not hear the words, but there was something urgent in her voice that was enough to put the trout out of his head. What had she found? He came, running, and found her looking under the clump of heather into a dark hole in the wall of grey rock. It was a hole, narrower at the top than at the bottom, big enough to let a stooping man use it as a doorway, and yet so well sheltered by the rock which, just here, leaned outward over it, and so deep in the shadow of the thick bushy heather that was growing out of cracks in the stone above it and on either side of it, that it would have been easy to think it was no more than a cleft in the rock, and easier still not to notice it at all. The two explorers crouched together, and tried to see into the black darkness inside.
“Fox,” said Roger, “or perhaps bear. It’s big enough for bear.”
“I wish I had my torch,” said Titty. “To-day I haven’t even got a box of matches.”
They picked up stones and threw them in. Nothing came out at them, though they almost thought that something might. Titty held the heather aside and reached in the full length of her arm, just for a moment.
“It gets bigger inside,” she said. “Higher, too. I believe we could stand up in it. Shall we go in? It’s not much good in the dark. Or shall we wait for torches?”
“Let’s go and get torches,” said Roger.
“Come on,” said Titty. “We’ll go and fetch the captain and the mate. We’ll leave Peter Duck to look after it till we come back. It’s his cave. I expect he’s known about it always. Come on.”
They ran down the valley, scrambled down the rocks by the lower waterfall, and raced along the sheep tracks through the heather and bracken. Just where the beck left the moorland to tumble headlong down through the steep woods, Titty pulled up.
“The Amazons are there too,” she said.
Roger looked at her, more than a little out of breath.
“They’ve discovered almost everything there is to discover,” she said, “but perhaps they don’t know about that. We’ll tell them about the valley, but keep the cave a secret, for us and Peter Duck.”
“We’ll
